Wis. Stat. § 973.07: Failure to pay fine, fees, surcharges, or costs or to comply with certain community service work.

If the fine, plus costs, fees, and surcharges imposed under ch. 814, are not paid or community service work under s. 943.017 (3) is not completed as required by the sentence, the defendant may be committed to the county jail until the fine, costs, fees, and surcharges are paid or discharged, or the community service work under s. 943.017 (3) is completed, for a period fixed by the court not to exceed 6 months.